package com.webserver.http;

import java.util.HashMap;
import java.util.Map;

/**
 * 该类定义所有和HTTP协议有关可被复用的数据信息
 */
public class HttpContext {
    /**
     * 回车符
     */
    public static final char CR = 13;
    /**
     * 换行符
     */
    public static final char LF = 10;
    /**
     * 存放所有资源的后缀与Content-Type头的对应关系。
     * key:资源后缀名
     * value:Content-Type头对应的值
     */
    private static Map<String,String> mimeMapping = new HashMap<>();

    static{
        //初始化mimeMapping
        initMimeMapping();
    }

    private static void initMimeMapping(){
        mimeMapping.put("html","text/html");
        mimeMapping.put("css","text/css");
        mimeMapping.put("js","application/javascript");
        mimeMapping.put("png","image/png");
        mimeMapping.put("jpg","image/jpeg");
        mimeMapping.put("gif","image/gif");
    }

    /**
     * 根据资源后缀名获取对应的Content-Type头信息
      * @param ext
     * @return
     */
    public static String getMimeType(String ext){
        return mimeMapping.get(ext);
    }
}
